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1、文章编号:1004—5589(2008)03—0252—08内蒙拜仁达坝银铅锌多金属矿床地质特征王力,孙丰月吉林大学地球科学学院,长春130061摘要:经详细的光、薄片鉴定和电子探针分析,认为该矿床矿石组成比较复杂,主要为磁黄铁矿、方铅矿、铁闪锌矿、毒砂、黄铁矿、银黝铜矿和黄铜矿等,其次还有闪锌矿、辉银矿、自然银、黝锡矿、硫锑铅矿、胶状黄铁矿、铅矾、褐铁矿和孔雀石等。其中银黝铜矿,黝锡矿和硫锑铅矿是本次工作新鉴定出的矿物。结合成矿地质特征、矿物共生组合特点和矿物间的穿插关系,将该矿床的成矿作用划分为热液成矿期和表生氧化期。热液期又可划分出4个成矿阶段:Ⅰ1毒砂2黄铁矿2石英阶段,该阶段矿化
2、较弱;Ⅱ1石英2闪锌矿2磁黄铁矿阶段,该阶段矿化范围大,强度大,是锌的主成矿阶段,并伴随少量的银矿化;Ⅲ1银多金属硫化物阶段,该阶段是该区最重要的银铅锌成矿阶段;Ⅳ1碳酸盐2萤石2玉髓阶段,该阶段在矿区内分布广泛,矿化不发育,属成矿的尾声。结合测温研究确定该矿床是受断裂构造控制的中温热液矿床。关键词:内蒙;拜仁达坝;矿物组成;成矿期次中图分类号:P61814文献标识码:AGeologicalcharacteristicsofBairendabaAg2Pb2ZnpolymetallicoredepositinInnerMongoliaWANGLi,SUNFeng2yueCollegeofEa
3、rthSciences,JilinUniversity,Changchun130061,ChinaAbstract:Basedonthemicroscopicstudyontransparentandpolishedthinsectionsandelectronicprobeanal2ysisfordifferentminerals,ithasbeenrealizedthatthemainoremineralassemblagesconsistofpyrrhotite,galena,marmatite,arsenopyrite,pyrite,freibergite,chalcopyrite
4、withminoramountofsphalerite,argentite,nativesilver,stannine,boulangerite,colloformpyrite,anglesite,limonite,malachite,etc.Amongthem,freibergite,stannine,boulangeritearefirstdiscoveredinthisoredistrictbytheauthors.Combinedwithore2formingcharacteristics,min2eralassemblages,andmineralcrosscutting,two
5、mineralizingperiods,i1e.hydrothermalandsupergeneones,areidentified.Therearefourmineralizingstagesinthehydrothermalperiod,includingⅠ.arsenopyrite2pyrite2quartzstagethatisofminorsignificanceformineralization;Ⅱ.quartz2spheralite2pyrrhotitestagethatisextensivelydevel2opedandisanimportantstageforzincwi
6、thminorsilver;Ⅲ.silver2polymetallicmineralstagethatismostimpor2tantepochforsilver,lead,andzinc;Ⅳ.carbonate2fluorite2chalcedonystage,representingtheendofthehydro2thermalactivity,whichiswidelydistributedintheoredistrictwithminorindustrialsignificance.ItissuggestedthatBairendabaAg2Pb2Znpolymetallicor
7、edepositbelongstomesothermaldepositcontrolledbyfractures.Keywords:InnerMongolia;Bairendaba;mineralassemblage;mineralizingperiodandstage收稿日期:2008201225;改回日期:2008206225基金项目:全国危机矿山接替资源找矿项目(200623018)第3期王力孙丰月:内蒙拜仁达坝银
